/* * Copyright (c) 1994-1996, 1998-2008 Todd C. Miller * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F39502-99-1-0512. */ #ifdef __TANDEM # include #endif #include #include #include #include #include #include #include #ifdef STDC_HEADERS # include # include #else # ifdef HAVE_STDLIB_H # include # endif #endif /* STDC_HEADERS */ #ifdef HAVE_STRING_H # include #else # ifdef HAVE_STRINGS_H # include # endif #endif /* HAVE_STRING_H */ #ifdef HAVE_UNISTD_H # include #endif /* HAVE_UNISTD_H */ #include #include #include #include #include #include #include "sudo.h" #ifndef lint __unused static const char rcsid[] = "$Sudo: logging.c,v 1.203 2008/11/09 14:13:12 millert Exp $"; #endif /* lint */ static void do_syslog __P((int, char *)); static void do_logfile __P((char *)); static void send_mail __P((char *)); static int should_mail __P((int)); static char *get_timestr __P((void)); static void mysyslog __P((int, const char *, ...)); static char *new_logline __P((const char *, int)); #define MAXSYSLOGTRIES 16 /* num of retries for broken syslogs */ /* * We do an openlog(3)/closelog(3) for each message because some * authentication methods (notably PAM) use syslog(3) for their * own nefarious purposes and may call openlog(3) and closelog(3). * Note that because we don't want to assume that all systems have * vsyslog(3) (HP-UX doesn't) "%m" will not be expanded. * Sadly this is a maze of #ifdefs. */ static void #ifdef __STDC__ mysyslog(int pri, const char *fmt, ...) #else mysyslog(pri, fmt, va_alist) int pri; const char *fmt; va_dcl #endif { #ifdef BROKEN_SYSLOG int i; #endif char buf[MAXSYSLOGLEN+1]; va_list ap; #ifdef __STDC__ va_start(ap, fmt); #else va_start(ap); #endif #ifdef LOG_NFACILITIES openlog("sudo", 0, def_syslog); #else openlog("sudo", 0); #endif vsnprintf(buf, sizeof(buf), fmt, ap); #ifdef BROKEN_SYSLOG /* * Some versions of syslog(3) don't guarantee success and return * an int (notably HP-UX < 10.0). So, if at first we don't succeed, * try, try again... */ for (i = 0; i < MAXSYSLOGTRIES; i++) if (syslog(pri, "%s", buf) == 0) break; #else syslog(pri, "%s", buf); #endif /* BROKEN_SYSLOG */ va_end(ap); closelog(); } /* * Log a message to syslog, pre-pending the username and splitting the * message into parts if it is longer than MAXSYSLOGLEN. */ static void do_syslog(pri, msg) int pri; char *msg; { size_t len, maxlen; char *p, *tmp, save; const char *fmt; const char *fmt_first = "%8s : %s"; const char *fmt_contd = "%8s : (command continued) %s"; /* * Log the full line, breaking into multiple syslog(3) calls if necessary */ fmt = fmt_first; maxlen = MAXSYSLOGLEN - (sizeof(fmt_first) - 6 + strlen(user_name)); for (p = msg; *p != '\0'; ) { len = strlen(p); if (len > maxlen) { /* * Break up the line into what will fit on one syslog(3) line * Try to avoid breaking words into several lines if possible. */ tmp = memrchr(p, ' ', maxlen); if (tmp == NULL) tmp = p + maxlen; /* NULL terminate line, but save the char to restore later */ save = *tmp; *tmp = '\0'; mysyslog(pri, fmt, user_name, p); *tmp = save; /* restore saved character */ /* Advance p and eliminate leading whitespace */ for (p = tmp; *p == ' '; p++) ; } else { mysyslog(pri, fmt, user_name, p); p += len; } fmt = fmt_contd; maxlen = MAXSYSLOGLEN - (sizeof(fmt_contd) - 6 + strlen(user_name)); } } static void do_logfile(msg) char *msg; { char *full_line; char *beg, *oldend, *end; FILE *fp; mode_t oldmask; size_t maxlen; oldmask = umask(077); maxlen = def_loglinelen > 0 ? def_loglinelen : 0; fp = fopen(def_logfile, "a"); (void) umask(oldmask); if (fp == NULL) { easprintf(&full_line, "Can't open log file: %s: %s", def_logfile, strerror(errno)); send_mail(full_line); efree(full_line); } else if (!lock_file(fileno(fp), SUDO_LOCK)) { easprintf(&full_line, "Can't lock log file: %s: %s", def_logfile, strerror(errno)); send_mail(full_line); efree(full_line); } else { if (def_loglinelen == 0) { /* Don't pretty-print long log file lines (hard to grep) */ if (def_log_host) (void) fprintf(fp, "%s : %s : HOST=%s : %s\n", get_timestr(), user_name, user_shost, msg); else (void) fprintf(fp, "%s : %s : %s\n", get_timestr(), user_name, msg); } else { if (def_log_host) easprintf(&full_line, "%s : %s : HOST=%s : %s", get_timestr(), user_name, user_shost, msg); else easprintf(&full_line, "%s : %s : %s", get_timestr(), user_name, msg); /* * Print out full_line with word wrap */ beg = end = full_line; while (beg) { oldend = end; end = strchr(oldend, ' '); if (maxlen > 0 && end) { *end = '\0'; if (strlen(beg) > maxlen) { /* too far, need to back up & print the line */ if (beg == (char *)full_line) maxlen -= 4; /* don't indent first line */ *end = ' '; if (oldend != beg) { /* rewind & print */ end = oldend-1; while (*end == ' ') --end; *(++end) = '\0'; (void) fprintf(fp, "%s\n ", beg); *end = ' '; } else { (void) fprintf(fp, "%s\n ", beg); } /* reset beg to point to the start of the new substr */ beg = end; while (*beg == ' ') ++beg; } else { /* we still have room */ *end = ' '; } /* remove leading whitespace */ while (*end == ' ') ++end; } else { /* final line */ (void) fprintf(fp, "%s\n", beg); beg = NULL; /* exit condition */ } } efree(full_line); } (void) fflush(fp); (void) lock_file(fileno(fp), SUDO_UNLOCK); (void) fclose(fp); } } /* * Log and mail the denial message, optionally informing the user. */ void log_denial(status, inform_user) int status; int inform_user; { char *message; char *logline; /* Set error message. */ if (ISSET(status, FLAG_NO_USER)) message = "user NOT in sudoers"; else if (ISSET(status, FLAG_NO_HOST)) message = "user NOT authorized on host"; else message = "command not allowed"; logline = new_logline(message, 0); if (should_mail(status)) send_mail(logline); /* send mail based on status */ /* Inform the user if they failed to authenticate. */ if (inform_user) { if (ISSET(status, FLAG_NO_USER)) (void) fprintf(stderr, "%s is not in the sudoers file. %s", user_name, "This incident will be reported.\n"); else if (ISSET(status, FLAG_NO_HOST)) (void) fprintf(stderr, "%s is not allowed to run sudo on %s. %s", user_name, user_shost, "This incident will be reported.\n"); else if (ISSET(status, FLAG_NO_CHECK)) (void) fprintf(stderr, "Sorry, user %s may not run sudo on %s.\n", user_name, user_shost); else (void) fprintf(stderr, "Sorry, user %s is not allowed to execute '%s%s%s' as %s%s%s on %s.\n", user_name, user_cmnd, user_args ? " " : "", user_args ? user_args : "", list_pw ? list_pw->pw_name : runas_pw ? runas_pw->pw_name : user_name, runas_gr ? ":" : "", runas_gr ? runas_gr->gr_name : "", user_host); } /* * Log via syslog and/or a file. */ if (def_syslog) do_syslog(def_syslog_badpri, logline); if (def_logfile) do_logfile(logline); efree(logline); } /* * Log and potentially mail the allowed command. */ void log_allowed(status) int status; { char *logline; logline = new_logline(NULL, 0); if (should_mail(status)) send_mail(logline); /* send mail based on status */ /* * Log via syslog and/or a file. */ if (def_syslog) do_syslog(def_syslog_goodpri, logline); if (def_logfile) do_logfile(logline); efree(logline); } void #ifdef __STDC__ log_error(int flags, const char *fmt, ...) #else log_error(flags, fmt, va_alist) int flags; const char *fmt; va_dcl #endif { int serrno = errno; char *message; char *logline; va_list ap; #ifdef __STDC__ va_start(ap, fmt); #else va_start(ap); #endif /* Become root if we are not already to avoid user interference */ set_perms(PERM_ROOT); /* Expand printf-style format + args. */ evasprintf(&message, fmt, ap); va_end(ap); if (ISSET(flags, MSG_ONLY)) logline = message; else logline = new_logline(message, ISSET(flags, USE_ERRNO) ? serrno : 0); /* * Tell the user. */ if (!ISSET(flags, NO_STDERR)) { if (ISSET(flags, USE_ERRNO)) warning("%s", message); else warningx("%s", message); } efree(message); /* * Send a copy of the error via mail. */ if (!ISSET(flags, NO_MAIL)) send_mail(logline); /* * Log to syslog and/or a file. */ if (def_syslog) do_syslog(def_syslog_badpri, logline); if (def_logfile) do_logfile(logline); if (logline != message) efree(logline); if (!ISSET(flags, NO_EXIT)) { cleanup(0); exit(1); } } #define MAX_MAILFLAGS 63 /* * Send a message to MAILTO user */ static void send_mail(line) char *line; { FILE *mail; char *p; int fd, pfd[2], status; pid_t pid, rv; sigaction_t sa; #ifndef NO_ROOT_MAILER static char *root_envp[] = { "HOME=/", "PATH=/usr/bin:/bin", "LOGNAME=root", "USERNAME=root", "USER=root", NULL }; #endif /* Just return if mailer is disabled. */ if (!def_mailerpath || !def_mailto) return; /* Fork and return, child will daemonize. */ switch (pid = fork()) { case -1: /* Error. */ error(1, "cannot fork"); break; case 0: /* Child. */ switch (pid = fork()) { case -1: /* Error. */ mysyslog(LOG_ERR, "cannot fork: %m"); _exit(1); case 0: /* Grandchild continues below. */ break; default: /* Parent will wait for us. */ _exit(0); } break; default: /* Parent. */ do { #ifdef HAVE_WAITPID rv = waitpid(pid, &status, 0); #else rv = wait(&status); #endif } while (rv == -1 && errno == EINTR); return; } /* Daemonize - disassociate from session/tty. */ #ifdef HAVE_SETSID if (setsid() == -1) warning("setsid"); #else setpgrp(0, 0); # ifdef TIOCNOTTY if ((fd = open(_PATH_TTY, O_RDWR, 0644)) != -1) { ioctl(fd, TIOCNOTTY, NULL); close(fd); } # endif #endif chdir("/"); if ((fd = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) { (void) dup2(fd, STDIN_FILENO); (void) dup2(fd, STDOUT_FILENO); (void) dup2(fd, STDERR_FILENO); } /* Close password, group and other fds so we don't leak. */ sudo_endpwent(); sudo_endgrent(); closefrom(STDERR_FILENO + 1); /* Ignore SIGPIPE in case mailer exits prematurely (or is missing). */ zero_bytes(&sa, sizeof(sa)); sigemptyset(&sa.sa_mask); sa.sa_flags = 0; sa.sa_handler = SIG_IGN; (void) sigaction(SIGPIPE, &sa, NULL); if (pipe(pfd) == -1) { mysyslog(LOG_ERR, "cannot open pipe: %m"); _exit(1); } switch (pid = fork()) { case -1: /* Error. */ mysyslog(LOG_ERR, "cannot fork: %m"); _exit(1); break; case 0: { char *argv[MAX_MAILFLAGS + 1]; char *mpath, *mflags; int i; /* Child, set stdin to output side of the pipe */ if (pfd[0] != STDIN_FILENO) { (void) dup2(pfd[0], STDIN_FILENO); (void) close(pfd[0]); } (void) close(pfd[1]); /* Build up an argv based the mailer path and flags */ mflags = estrdup(def_mailerflags); mpath = estrdup(def_mailerpath); if ((argv[0] = strrchr(mpath, ' '))) argv[0]++; else argv[0] = mpath; i = 1; if ((p = strtok(mflags, " \t"))) { do { argv[i] = p; } while (++i < MAX_MAILFLAGS && (p = strtok(NULL, " \t"))); } argv[i] = NULL; /* * Depending on the config, either run the mailer as root * (so user cannot kill it) or as the user (for the paranoid). */ #ifndef NO_ROOT_MAILER set_perms(PERM_ROOT); execve(mpath, argv, root_envp); #else set_perms(PERM_FULL_USER); execv(mpath, argv); #endif /* NO_ROOT_MAILER */ mysyslog(LOG_ERR, "cannot execute %s: %m", mpath); _exit(127); } break; } (void) close(pfd[0]); mail = fdopen(pfd[1], "w"); /* Pipes are all setup, send message. */ (void) fprintf(mail, "To: %s\nFrom: %s\nAuto-Submitted: %s\nSubject: ", def_mailto, def_mailfrom ? def_mailfrom : user_name, "auto-generated"); for (p = def_mailsub; *p; p++) { /* Expand escapes in the subject */ if (*p == '%' && *(p+1) != '%') { switch (*(++p)) { case 'h': (void) fputs(user_host, mail); break; case 'u': (void) fputs(user_name, mail); break; default: p--; break; } } else (void) fputc(*p, mail); } (void) fprintf(mail, "\n\n%s : %s : %s : %s\n\n", user_host, get_timestr(), user_name, line); fclose(mail); do { #ifdef HAVE_WAITPID rv = waitpid(pid, &status, 0); #else rv = wait(&status); #endif } while (rv == -1 && errno == EINTR); _exit(0); } /* * Determine whether we should send mail based on "status" and defaults options. */ static int should_mail(status) int status; { return(def_mail_always || ISSET(status, VALIDATE_ERROR) || (def_mail_no_user && ISSET(status, FLAG_NO_USER)) || (def_mail_no_host && ISSET(status, FLAG_NO_HOST)) || (def_mail_no_perms && !ISSET(status, VALIDATE_OK))); } /* * Return an ascii string with the current date + time * Uses strftime() if available, else falls back to ctime(). */ static char * get_timestr() { char *s; time_t now = time((time_t) 0); #ifdef HAVE_STRFTIME static char buf[128]; struct tm *timeptr; timeptr = localtime(&now); if (def_log_year) s = "%h %e %T %Y"; else s = "%h %e %T"; /* strftime() does not guarantee to NUL-terminate so we must check. */ buf[sizeof(buf) - 1] = '\0'; if (strftime(buf, sizeof(buf), s, timeptr) && buf[sizeof(buf) - 1] == '\0') return(buf); #endif /* HAVE_STRFTIME */ s = ctime(&now) + 4; /* skip day of the week */ if (def_log_year) s[20] = '\0'; /* avoid the newline */ else s[15] = '\0'; /* don't care about year */ return(s); } #define LL_TTY_STR "TTY=" #define LL_CWD_STR "PWD=" /* XXX - should be CWD= */ #define LL_USER_STR "USER=" #define LL_GROUP_STR "GROUP=" #define LL_ENV_STR "ENV=" #define LL_CMND_STR "COMMAND=" /* * Allocate and fill in a new logline. */ static char * new_logline(message, serrno) const char *message; int serrno; { size_t len = 0; char *evstr = NULL; char *errstr = NULL; char *line; /* * Compute line length */ if (message != NULL) len += strlen(message) + 3; if (serrno) { errstr = strerror(serrno); len += strlen(errstr) + 3; } len += sizeof(LL_TTY_STR) + 2 + strlen(user_tty); len += sizeof(LL_CWD_STR) + 2 + strlen(user_cwd); if (runas_pw != NULL) len += sizeof(LL_USER_STR) + 2 + strlen(runas_pw->pw_name); if (runas_gr != NULL) len += sizeof(LL_GROUP_STR) + 2 + strlen(runas_gr->gr_name); if (sudo_user.env_vars != NULL) { size_t evlen = 0; struct list_member *cur; for (cur = sudo_user.env_vars; cur != NULL; cur = cur->next) evlen += strlen(cur->value) + 1; evstr = emalloc(evlen); evstr[0] = '\0'; for (cur = sudo_user.env_vars; cur != NULL; cur = cur->next) { strlcat(evstr, cur->value, evlen); strlcat(evstr, " ", evlen); /* NOTE: last one will fail */ } len += sizeof(LL_ENV_STR) + 2 + evlen; } len += sizeof(LL_CMND_STR) - 1 + strlen(user_cmnd); if (user_args != NULL) len += strlen(user_args) + 1; /* * Allocate and build up the line. */ line = emalloc(++len); line[0] = '\0'; if (message != NULL) { if (strlcat(line, message, len) >= len || strlcat(line, errstr ? " : " : " ; ", len) >= len) goto toobig; } if (serrno) { if (strlcat(line, errstr, len) >= len || strlcat(line, " ; ", len) >= len) goto toobig; } if (strlcat(line, LL_TTY_STR, len) >= len || strlcat(line, user_tty, len) >= len || strlcat(line, " ; ", len) >= len) goto toobig; if (strlcat(line, LL_CWD_STR, len) >= len || strlcat(line, user_cwd, len) >= len || strlcat(line, " ; ", len) >= len) goto toobig; if (runas_pw != NULL) { if (strlcat(line, LL_USER_STR, len) >= len || strlcat(line, runas_pw->pw_name, len) >= len || strlcat(line, " ; ", len) >= len) goto toobig; } if (runas_gr != NULL) { if (strlcat(line, LL_GROUP_STR, len) >= len || strlcat(line, runas_gr->gr_name, len) >= len || strlcat(line, " ; ", len) >= len) goto toobig; } if (evstr != NULL) { if (strlcat(line, LL_ENV_STR, len) >= len || strlcat(line, evstr, len) >= len || strlcat(line, " ; ", len) >= len) goto toobig; efree(evstr); } if (strlcat(line, LL_CMND_STR, len) >= len || strlcat(line, user_cmnd, len) >= len) goto toobig; if (user_args != NULL) { if (strlcat(line, " ", len) >= len || strlcat(line, user_args, len) >= len) goto toobig; } return (line); toobig: errorx(1, "internal error: insufficient space for log line"); }